Advanced voice communication with acoustic echo cancelling and enhanced sound quality

Author

Weiss, Christoph ; Berlin, Fridtjof ; Geller, Dieter

Author_Institution

Siemens AG, Munich, Germany

fYear

1991

fDate

23-26 Jun 1991

Firstpage

478

Abstract

The authors first consider speech coding according to CCITT-Rec. G.722, which allows an increased audio bandwidth of 7 kHz at a data rate of 64 kbit/s in the ISDN (integrated services digital network). The problem of hands-free telephony is then afforded special attention and a solution is proposed utilizing an acoustic echo canceller. The objective is to develop a compact implementation of both algorithms, using digital signal processors, which also provides for optimal determination and control of system parameters. The results are discussed and applications for future services are presented

Keywords

ISDN; codecs; echo suppression; encoding; speech analysis and processing; telephony; 64 kbit/s; 7 kHz; CCITT-Rec. G.722; ISDN; acoustic echo cancelling; audio bandwidth; codec; data rate; digital signal processors; hands-free telephony; integrated services digital network; optimal control; optimal determination; sound quality; speech coding; system parameters; voice communication; Bandwidth; Codecs; Decoding; Filters; Frequency; ISDN; Signal processing; Speech; Telephony; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1991. ICC '91, Conference Record. IEEE International Conference on

Conference_Location

Denver, CO

Print_ISBN

0-7803-0006-8

Type

conf

DOI

10.1109/ICC.1991.162412

Filename

162412